Thanks 2000mc!
I was able to get that to work! I saw how to do it on the older connector, but couldn't find any info on this odd year with the OBD2 style connector!
Once I jumpered those pins and turned the truck on, the check engine light flashed once, then twice, and repeated that three times.
Then it flashed 3 times and two times and repeated that pattern three times total, then started the 1,2 1,2 1,2 ... 3,2 3,2 3,2...
It's my understanding that the truck is giving me the codes for 12 and 32.
According to
Troublcodes.net Trouble Codes OBD & OBD2 Trouble Codes and Technical info & Tool Store. By BAT Auto Technical :
code 32 means
"32 EGR open command did not change the fuel mixture when the command was given during off idle operation. EGR opening should cause the mixture to be slightly richer because of the low oxygen content of exhaust gas."
So what the heck is an EGR? What's it do? And how do I fix it?
And what about the error code 12? It's not listed on that page!
EDIT: In a list of generic GM OBD2 codes, it says 12 is diagnostic mode and that 32 covers:
BARO sensor circuit(carb models)
EGR circuit(injected models)
MAP sensor(open)
I think we can eliminate the BARO as my truck is fuel injected.